[TI-84] - Question About TI 84 Silver Ed

[PSG]

I have a few problems that I have to solve. I need to click on the 2nd button and then VARS then I need to go to to invNorm. Whatever video I have seen, it goes directly to that section. When I click on it, it takes me to invNorm, and tells me

area:
Mu symbol
Signa symbol.
Paste.

How can I just cancel that off from my calculator and go straight into the last section? Because the only way I can right now is plugging in numbers, then clicking paste, then I have to change my numbers again.

Sorry if that sounded confusing.

And it's like that for all my features, 1:normalpdf, 2:normalcdf, etc etc.

[Dason]

I really don't now what you're asking. What is the problem?

[PSG]

Basically when I hit 2nd and then VARS, I need to use one of the features, iie. normalpdf, normalcdf,invNorm... When I click one of them I have to input for x values, sigma and etc before I move forward. Other videos I have seen, it takes them directly to that feature.

Go to 1:47 of the video. See how she selects 3 and presses enter? It does not give that feature till I plug in x value, sigma and etc.. I know it's a bit confusing since explaining sucks. If there is no explanation, I will just wait it out and ask somebody in class in a few days or ask the profe. Well, anyways here is the video if you go to 1:47.

http://www.youtube.com/watch?v=6-oTQQz9YQw

[SmoothJohn]

The syntax of the invnorm function on the TI 84 allows you to work in two ways.

1. If you are concerned with a standard normal distribution (mean=0, SD=1) then all you type is invnorm(p) and you will get the z-score that corresponds to that probability. (i.e. the area under the standard normal curve bounded by -infinity and p)

2. If you have a normal distribution with mean=mu and SD=sigma, and probability p, the syntax is invnorm(p,mu.sigma).

3. Notice that #1 is just a simplified syntax for invnorm(p,1,0).

Does this answer your question?

John